text: //===- VPlanTransforms.h - Utility VPlan to VPlan transforms --------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  ///
  /// \file
  /// This file provides utility VPlan to VPlan transformations.
  //===----------------------------------------------------------------------===//
  
  #ifndef LLVM_TRANSFORMS_VECTORIZE_VPLANTRANSFORMS_H
  #define LLVM_TRANSFORMS_VECTORIZE_VPLANTRANSFORMS_H
  
  #include "VPlan.h"
  #include "llvm/ADT/STLExtras.h"
  #include "llvm/Transforms/Vectorize/LoopVectorizationLegality.h"
  
  namespace llvm {
  
  class InductionDescriptor;
  class Instruction;
  class PHINode;
  class ScalarEvolution;
  
  struct VPlanTransforms {
    /// Replaces the VPInstructions in \p Plan with corresponding
    /// widen recipes.
    static void
    VPInstructionsToVPRecipes(Loop *OrigLoop, VPlanPtr &Plan,
                              function_ref<const InductionDescriptor *(PHINode *)>
                                  GetIntOrFpInductionDescriptor,
                              SmallPtrSetImpl<Instruction *> &DeadInstructions,
                              ScalarEvolution &SE);
  
    static bool sinkScalarOperands(VPlan &Plan);
  
    static bool mergeReplicateRegions(VPlan &Plan);
  
    /// Remove redundant casts of inductions.
    ///
    /// Such redundant casts are casts of induction variables that can be ignored,
    /// because we already proved that the casted phi is equal to the uncasted phi
    /// in the vectorized loop. There is no need to vectorize the cast - the same
    /// value can be used for both the phi and casts in the vector loop.
    static void removeRedundantInductionCasts(VPlan &Plan);
  };
  
  } // namespace llvm
  
  #endif // LLVM_TRANSFORMS_VECTORIZE_VPLANTRANSFORMS_H
  